Question 930534
cot&#952; = 1/2, sin &#952; < 0 , sin&#952; = -2/&#8730;5 = -2&#8730;5 /5  , cos&#952; = -1/&#8730;5 =- &#8730;5/5
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&#61618;sin (11&#960;/6) = -1/2 , cos (11&#960;/6) = &#8730;3 /2 
..... Plug and Play &#61608; &#61607; &#61613;&#61623;&#61618; &#61608; &#61629;&#61617;&#61613; 
sin(x - y) = sin x cosy -  cos x sin y&#61623;
&#61618;sin(&#952; &#8722; 11&#960;/6) =  
.......
tan 2&#952; = 2tanx / (1-tan^2x) = 4/(1-4) = -4/3
tan ( 3&#960;/2) = cos/sin = 0
.........Plug and Play
tan(x + y) =  tan x + tan y)/(1- tan x tan y
tan(2&#952; + 3&#960;/2) = -4/3
..........
(cosx, sinx) Summary Unit Circle
*[illustration wheel_smaller.jpg].